Omron C200HE-CPU42 User Manual

85
Input Units
Error Probable cause Possible correction
Indicator lights are turned off, and no
inputs turn ON.
No external input power supply is
provided.
Provide a power supply.
pu s u O
The external input voltage is low. Supply the rated voltage.
Terminal screws are loose. Tighten the terminal screws.
Terminal block connectors are making
poor contact.
Securely lock the connectors, or
replace them if necessary.
Indicator lights are turned ON, but no
inputs turn ON.
The input circuit is defective. Replace the Unit.
All inputs remain ON, and will not turn
OFF.
The input circuit is defective. Replace the Unit.
Inputs do not turn ON for particular
Rl b
An input device is defective. Replace the input device.
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Relay numbers.
Input wiring is disconnected. Check the input wiring.
Terminal screws are loose. Tighten the terminal screws.
Terminal block connectors are making
poor contact.
Securely lock the connectors, or
replace them if necessary.
The ON time for external inputs is too
short.
Adjust the input device.
The input circuit is defective. Replace the Unit.
An input bit address is used for an
OUT instruction in the program.
Correct the program.
Inputs do not turn OFF for particular
Rl b
The input circuit is defective. Replace the Unit.
pp
Relay numbers.
An input bit address is used for an
OUT instruction in the program.
Correct the program.
Inputs are turning ON and OFF
ill
The external input voltage is low. Supply the rated voltage.
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irregularly.
There is malfunctioning due to noise. Apply noise countermeasures such as
installing a surge suppressor,
installing an isolation transformer, and
using shielded cables.
Terminal screws are loose. Tighten the terminal screws.
Terminal block connectors are making
poor contact.
Securely lock the connectors, or
replace them if necessary.
Malfunctioning Relays are in groups of
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Common terminal screws are loose. Tighten the terminal screws.
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eight.
Terminal block connectors are making
poor contact.
Securely lock the connectors, or
replace them if necessary.
The CPU Unit is defective. Replace the CPU Unit.
Operation is normal, but the input
indicator does not light.
The LED is defective. Replace the Unit.
Troubleshooting Section 5-1

Omron C200HE-CPU42 Specifications

General

Brand	Omron
Model	C200HE-CPU42
Category	Controller
Language	English